Figure1. The sequence of cyclic process
The cyclic process contains four steps namely adsorption, heating,
evacuation and cooling with total time of 8 hr’s and 45 minutes.
Briefly, the polluted air passes through horizontal bed and VOCs are
adsorbed on activated carbon surfaces and purified air is released into
atmosphere. After adsorption stage, steam is utilized at 120°C to desorb
VOC and then hot air evacuates/purges the adsorption bed from condensate
water. The regenerated gas (air, steam, condensate water and VOCs) are
subjected to cooler for controlling its temperature. The remained gas is
released into atmosphere and VOCs are now presented in liquid phase and
they undergo further treatment while the adsorption bed is finally
cooled via cold air.